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The effect of heat treatment on the mechanical properties and residual stresses in a HPDC component of Al-Si-Mn alloy
Linköping University, Department of Management and Engineering. Linköping University, The Institute of Technology.
Linköping University, Department of Management and Engineering. Linköping University, The Institute of Technology.
2007 (English)Conference paper, Published paper (Refereed)
Abstract [en]

This study aims at investigating the influence of the heat treatment process on microstructure, mechanical properties and residual stresses in a high pressure die cast (HPDC) of an aluminum alloy component. Two series of high pressure die cast components containing mainly Al -Si 8.4- Mn 0.43 were tested. The first group of components was as cast and the second heat treated. X-ray diffraction, quantitative metallography and mechanical testing methods were used to determine the residual stresses, microstructural features and mechanical properties respectively. Results indicate that the amount of residual stresses varies depending on heat treatment process. The selected heat treatment process can also change the microstructure and mechanical properties.

Place, publisher, year, edition, pages
2007.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-39193Local ID: 47126OAI: oai:DiVA.org:liu-39193DiVA: diva2:260042
Conference
5th International Conference on Mechanical Stress Evaluation by Neutrons and Synchrotron Radiation, September 24-26, Vienna, Austria
Available from: 2009-10-10 Created: 2009-10-10 Last updated: 2011-08-24Bibliographically approved
In thesis
1. On the Residual Stresses and Microstructure Formation of Aluminum-Silicon Cast Alloys
Open this publication in new window or tab >>On the Residual Stresses and Microstructure Formation of Aluminum-Silicon Cast Alloys
2011 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Cast aluminum-silicon alloys are being increasingly used in automotive and aerospace industries for critical structure applications because of their excellent castability, low density, acceptable mechanical properties and low cost. Different casting and heat treatment parameters largely affect the microstructure and residual stress of the components, which in turn, has a great impact on their mechanical properties. In cast components, residual stresses are those stresses which may remain in the casting after it has been removed from the mould. The magnitude and distribution of the residual stresses can be critical to performance and should be considered in the design of a component. This work has been devoted to study the microstructure formation, residual stresses, and mechanical properties of aluminum-silicon castings.

The effects of casting parameters on the microstructure of the selected alloys were investigated by means of optical and scanning electron microscopes. With the help of EDS, WDS, EBSD, and quantitative analysis techniques, it was found that solidification rate, modification, superheat, casting temperature can significantly affect the nucleation and growth, morphology and chemical composition of different phases. Based on the performed microsegregation analysis, a clear correlation between the concentration of silicon in the primary phase and cooling rate was found.

Tensile tests at room and elevated temperatures in addition to microhardness experiments were performed to analyse the behaviour of the alloys under mechanical loads. The results showed that elongation to fracture, modulus of elasticity, and ultimate tensile strength of the tested alloys are temperature dependent. Moreover, the obtained information was used to establish a good model for simulating the behaviour of the cast alloys, as well as the mechanical properties and residual stresses.

The type and magnitude of residual stresses were mainly evaluated by strain gauge, sectioning, thermal analysis methods, and was also simulated by finite element analysis using Abaqus software. It was found that casting parameters such as superheat, mould hardness, casting temperature, modification, and the casting geometry, can influence the accumulated residual stress in the component. The thermal treatment experiments also indicated that the base temperature of the cast part before fast cooling, maximum temperature difference within the component, and cooling water flow can influence the residual stress. Extensive simulation work done by Abaqus showed that the results obtained by simulation are in a reasonable relationship with the experimental measurements, considering the linearly elastic/linearly isotropically hardening plastic model.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2011. 48 p.
Series
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1369
Keyword
Al-Si alloys, residual stresses, microstructure, microsegregation, nucleation behavior, modeling
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-70117 (URN)978-91-7393-176-2 (ISBN)
Public defence
2011-09-07, A35, A-huset, Campus Valla, Linköpings universitet, Linköping, 10:15 (English)
Opponent
Supervisors
Available from: 2011-08-19 Created: 2011-08-19 Last updated: 2012-01-19Bibliographically approved

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Sadrossadat, MohsenJohansson, Sten

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